Abstract
Full-scale forced-vibration tests conducted before and after structural repairs on a multispan reinforced-concrete highway bridge are described in the paper. The tests were conducted to investigate any correlation that may exist between the repair works and changes in the dynamic characteristics of the bridge. The approach adopted is suitable for assessing the structural condition of a bridge using vibration data. A purpose-built hydraulic vibrator was used to artificially excite the bridge, and the dynamic response was measured by accelerometers placed on the bridge deck. A single-degree-of-freedom model was fitted to the response functions in order to extract natural frequencies, modal damping ratios, and mode shapes. It was found that the repair works caused a slight reduction in the natural frequencies but there was no definite trend in the changes to the modal damping ratios. Comparison of the mode shapes before and after repairs using modal analysis procedures was found to give an indication of the ...
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